WO2020172815A1 - Tool and method for setting an anchor - Google Patents

Tool and method for setting an anchor Download PDF

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Publication number
WO2020172815A1
WO2020172815A1 PCT/CN2019/076311 CN2019076311W WO2020172815A1 WO 2020172815 A1 WO2020172815 A1 WO 2020172815A1 CN 2019076311 W CN2019076311 W CN 2019076311W WO 2020172815 A1 WO2020172815 A1 WO 2020172815A1
Authority
WO
WIPO (PCT)
Prior art keywords
socket
tool
driver
motor
anchor
Prior art date
Application number
PCT/CN2019/076311
Other languages
English (en)
French (fr)
Inventor
Kwok Ting Mok
Zhi Qin Cui
Tsz Him KWOK
Mark Huggins
Original Assignee
Tti (Macao Commercial Offshore) Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tti (Macao Commercial Offshore) Limited filed Critical Tti (Macao Commercial Offshore) Limited
Priority to PCT/CN2019/076311 priority Critical patent/WO2020172815A1/en
Priority to CN201990001312.0U priority patent/CN217976925U/zh
Priority to EP19917368.3A priority patent/EP3931451A4/en
Publication of WO2020172815A1 publication Critical patent/WO2020172815A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/02—Arrangements for handling screws or nuts
    • B25B23/08—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation
    • B25B23/12—Arrangements for handling screws or nuts for holding or positioning screw or nut prior to or during its rotation using magnetic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B31/00—Hand tools for applying fasteners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
    • F16B13/002—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose self-cutting
    • F16B13/003—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose self-cutting with a separate drilling bit attached to or surrounded by the dowel element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
    • F16B25/0026—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being a hard non-organic material, e.g. stone, concrete or drywall

Definitions

  • the present invention relates to a tool for setting an anchor, particularly a plasterboard anchor (also known as a drywall anchor or hollow wall anchor) .
  • a plasterboard anchor also known as a drywall anchor or hollow wall anchor
  • Anchors of the expanding type are commonly used for securing, from one side, a socket receiving a screw in a plasterboard panel, when the other side is inaccessible.
  • Advantages of this type of anchor in which the sockets are made of a ferromagnetic alloy are that it provides a cost-effective, secure wall fastening, engaging both sides of the plasterboard panel so it cannot be lost inside the wall and with the screw fastener removed, all that is visible externally is the flange of the socket that abuts the outer surface of the panel.
  • conventional installation of this type of anchor involves a number of steps and different tools, so it has the disadvantage of being rather time consuming.
  • a tool for setting an anchor in a panel the anchor of a type comprising a socket and a screw fastener, the socket having coaxial inner and outer sleeve portions disposed at longitudinally opposing ends and joined by an intermediate portion, the outer sleeve portion having a tooth for engaging the panel to prevent rotation of the socket and a ferromagnetic flange at its outermost end, an internal thread in the inner sleeve portion, the screw fastener engaged with the internal thread and having a head at one end engaging the outer sleeve portion and an opposing projecting end projecting from the inner sleeve portion, the head including a drive fixture, whereby relative rotation between the screw fastener and the socket longitudinally collapses the socket to transversely spread the intermediate portion for setting the anchor;
  • the tool comprising:
  • a driver that includes a shaft for transmitting torque to a driver tip configured for form-fitting engagement with the drive fixture, the shaft having a longitudinal gap disposed between two axially-spaced shoulders;
  • a holder with a through-extending opening for receiving the shaft, the holder comprising at least one integral resilient finger adapted to be urged into the longitudinal gap to limit axial movement of the sleeve along the shaft between positions defined by the two shoulders, and a magnet fixed to the holder and disposed for holding the ferromagnetic flange.
  • the tool further comprises a powered handtool having a reversible rotary motor, a gearbox that transmits torque from the motor to the shaft of the driver, and a control circuit comprising a trigger switch, a current sensor and a controller, wherein the trigger switch is actuated to start the motor when a trigger is pressed by a user, the current sensor senses a level of current drawn by the motor, the controller controls the motor in response to a signal from the current sensor, and when in an operating state in which the trigger remains pressed to set the anchor and the motor operates to turn the driver in a first direction, in response to a signal indicating a pre-defined peak current level, the controller reverses the motor to turn the driver in a second direction opposite the first direction to back the screw fastener out of the socket.
  • a powered handtool having a reversible rotary motor, a gearbox that transmits torque from the motor to the shaft of the driver, and a control circuit comprising a trigger switch, a current sensor and a controller, wherein the
  • control circuit further comprises a user-actuable mode selector for placing the handtool in one of a driver mode and a set-and-extract mode, wherein the controller only reverses the motor in response to a signal indicating a pre-defined peak current level after being placed in the set-and-extract mode.
  • the controller measures an elapsed time from the time at which the trigger switch is first actuated, and an in-rush current at the pre-defined peak current level is disregarded by the controller, so as not to trigger reversal of the motor, provided the in-rush current occurs within a pre-determined elapsed time.
  • the shaft of the driver comprises an outer end in which a drive socket is formed, the driver further comprises a bit adapted for axial insertion into the drive socket, and the driver tip is formed on a one end of the bit.
  • a retaining magnet is fixed at a closed end of the drive socket for holding the bit.
  • the tool further comprises a single-use drill tip, a point formed at one end of the drill tip, an opposing end of the drill tip being annular and including an axially-extending blind recess, an internal thread in the blind recess for engagement with the projecting end of the screw fastener.
  • the invention provides an anchoring tool comprising:
  • an anchor including a socket and a screw fastener, the socket having coaxial inner and outer sleeve portions disposed at longitudinally opposing ends and joined by an intermediate portion, the outer sleeve portion having a tooth for engaging a panel to prevent rotation of the socket and a ferromagnetic flange at its outermost end, an internal thread in the inner sleeve portion, the screw fastener engaged with the internal thread and having a head at one end engaging the outer sleeve portion and an opposing projecting end projecting from the inner sleeve portion, the head including a drive fixture, whereby relative rotation between the screw fastener and the socket longitudinally collapses the socket to transversely spread the intermediate portion for setting the anchor, and
  • a single-use drill tip a point formed at one end of the drill tip, an opposing end of the drill tip being annular and including an axially-extending blind recess, an internal thread in the blind recess in which the projecting end of the screw fastener is received such that there is an axial gap between the drill tip and the socket, and the axial gap remains when the projecting end is at an end of its axial travel toward a blind end of the blind recess.
  • the drill tip comprises a body having a conical nose portion extending rearwardly from the point and a tapered portion longitudinally spaced from the conical nose portion, the conical nose portion having an included cone angle, axial flutes in the body defining first and second cutting edges, the first cutting edge extending rearwardly of the conical nose at the included cone angle, the second cutting edge being formed on the tapered portion.
  • first and second cutting edges are substantially coplanar, a first axial edge joins a rear of the first cutting edge to a front of the second cutting edge.
  • a second axial edge joins a rear of the second cutting edge to the annular opposing end.
  • the anchoring tool is adapted for use with a driver that includes a shaft for transmitting torque to a driver tip configured for form-fitting engagement with the drive fixture, the shaft having a longitudinal gap disposed between two axially-spaced shoulders, wherein the anchoring tool further comprises:
  • the holder comprising at least one integral resilient finger adapted to be urged into the longitudinal gap to limit axial movement of the sleeve along the shaft between positions defined by the two shoulders, and
  • a magnet fixed to the holder and disposed for holding the ferromagnetic flange.
  • the invention provides a method of setting an anchor of a type comprising a screw fastener engaged in a socket, the method comprising:
  • the method is performed automatically while a trigger of the handtool, pressed to start the motor, remains pressed by a user.
  • This invention provides a device which is effective and efficient in operational use, which may be economically constructed and has an overall simple design and operation which simplifies and reduces the time needed to complete installation of an anchor.
  • Figure 1 is an exploded perspective view of components of an anchor-setting tool according to the invention
  • Figure 2 is a fragmentary section in a longitudinal plane of assembled components of the anchor-setting tool of Fig. 1;
  • Figure 3 is a partially sectioned perspective view of the holder of the anchor-setting tool of Fig. 1;
  • Figures 4 and 5 are a front view and perspective view, respectively, of a single-use drill tip of the anchor-setting tool assembly of Fig. 1;
  • Figure 6 is a further fragmentary section in a longitudinal plane of components of the anchor-setting tool assembly of the invention.
  • Figure 7 is a schematic of a control circuit of the anchor-setting tool of the invention.
  • Figure 8 is graph of the variation of motor current (y-axis) with time (x-axis) during the different stages of an installation of an anchor using the method of the invention.
  • an anchor-setting tool 10 comprises a drive 11, a holder 12, a magnet 13 and, preferably, a single-use drill tip 14.
  • axial refers to a direction substantially parallel to the longitudinal axis 50.
  • radial refers to a direction substantially orthogonal to the longitudinal axis 50.
  • circumferential refers to the direction of a circular arc having a radius substantially orthogonal to the longitudinal axis 50.
  • the tool 10 is used for setting an anchor 73 of a well-known type, commonly referred to as a drywall anchor or hollow wall anchor, typically used for securing a socket 15 receiving a screw fastener 16 in drywall or plasterboard panel (not shown) from one side, when the other side is inaccessible.
  • the socket 15 has coaxial outer and inner sleeve portions 18, 19 disposed at longitudinally opposing ends and joined by an intermediate portion 20.
  • Two teeth 21 may be provided on the outer sleeve portion 18 to bite into the panel and prevent rotation of the socket 15.
  • a ferromagnetic flange 22 is disposed on the outermost end of the socket 15.
  • An internal thread 23 is formed in the inner sleeve portion 19.
  • the screw fastener 16 is engaged with the internal thread 23 and has a head 24 at one end in engagement with the outer sleeve portion 18 and an opposing projecting end 25 projecting from the inner sleeve portion 19.
  • a washer 26 may be disposed between the head 24 and outer sleeve portion 18 and in abutment therewith.
  • the intermediate portion 20 may be configured as a plurality of generally axially extending strips 27 circumferentially spaced from one another, and each defining three longitudinally-aligned hinges, such as living hinges, comprising: end hinges (not shown) at each end 28, 29 and an intermediate hinge (not shown) therebetween at 30.
  • the intermediate hinge at intermediate part 30 of the strips 27 is offset radially outwardly of a common axis between the end hinges 28, 29.
  • the driver 11 For turning the screw fastener 16, the driver 11 comprises an elongate shaft 17 for transmitting torque to a driver tip 31 for form-fitting engagement with a complementary drive fixture 32, such as the cruciform recess of a Philips drive, formed in the head 24.
  • the shaft 17 further comprises a longitudinal gap 33 which may be annular and disposed between inner and outer axially-spaced shoulders 34, 35.
  • the driver tip 31 may be formed on a one end of a bit 37 axially inserted in a drive socket 76 at an outer end of the shaft 17.
  • the bit 37 and drive socket 76 may have complementary hexagonal cross-sections and the bit 37 may be held in place by a retaining magnet 38 fixed at a closed end of the drive socket 76.
  • the holder 12 is an elongate member formed of resilient material with an axial through-extending opening 36 for receiving the shaft 17.
  • the holder 12 may have generally cylindrical walls in which axially elongated and diametrically opposing resilient fingers 39, 40 are formed by cutout sections 41 in the cylindrical walls.
  • the cutout sections 41 may be of like form, each generally U-shaped, comprising opposing arms 42 that converge toward the axially inner end and which are joined by a circumferential part 43.
  • the fingers 39, 40 bounded by these cutout sections 41 have a cantilever-type form, fixed at one end and each may have a radially-inwardly projecting tip 44, 45 at the opposing end.
  • the outer end of the holder 12 may have an annular recess 46 coaxial with the longitudinal axis.
  • the arm tips 44, 45 are resiliently urged into the longitudinal gap 33 disposed between the shoulders 34, 35 and serve to fix the holder 12 between axial positions defined by the shoulders 34, 35.
  • Fig. 2 shows the arm tips 44, 45 abutting the axially outermost shoulder 35, thus corresponding to a head 24 of the maximum axial dimension that can be accommodated by the illustrated holder 12. Screw heads with smaller axial dimension (not shown) require sliding the holder 12 axially inwardly.
  • a permanent magnet 13 is fixed to the holder and may be annular with an outer diameter fixed in the recess 46 and an inner diameter sized to receive the head 24 of the screw fastener 16.
  • the single-use drill tip 14 may be formed of hard plastic material and has a point 47 at one end and a blind recess 48 at an opposing annular end 49.
  • An internal thread in the blind recess 48 engages with the projecting end 25 of the screw fastener 16. In this manner, rotation in use in a cutting direction also tends to screw the projecting end 25 toward the blind end of the blind recess 48.
  • an axial gap 51 between the drill tip 14 and the end of the socket 15 allow the fastener 16 to turn to collapse the socket 15, which relative turning may otherwise be prevented if the drill tip 14 was to be tightened against the end of the socket 15.
  • the drill tip 14 tapers to broaden in a stepwise manner from the point 47.
  • the drill tip 14 has a conical nose portion 52 extending immediately rearwardly from the point 47.
  • Teeth 53 of like form may be equally circumferentially spaced and diverge from the nose portion 53 and extend axially, being separated by flutes 54 than extend axially from an inner end of the nose portion 52 to adjacent the annular end 49.
  • Each tooth 53 has two tapered cutting edges, a front cutting edge 55 extending rearwardly of the nose portion 52 and a rear cutting edge 57 axially spaced from the front cutting edge 55.
  • the front cutting edge 55 extends at the included cone angle of the nose portion 52.
  • a first conical land 56 may be provided on each tooth 53 adjacent the first cutting edge 55 and tangential to the conical nose portion 52.
  • a second conical land 58 may be provided on each tooth 53 adjacent the rear cutting edge 57. Cutting is thus performed in a stepwise manner, the first cutting edge 55 cutting to an intermediate diameter before the edge 57 cuts to the full diameter of the annular end 49.
  • Each tooth 53 comprises an axial length 59 of fixed diameter separating the cutting edges 55, 57 and may further comprise another axial section 60 of fixed diameter separating the rear cutting edge 57 from the annular end 49.
  • the anchor-setting tool 10 may further comprise a powered handtool 61.
  • the powered handtool 61 has a motor 63, preferably an electronically controlled brushless DC motor.
  • a gearbox 62 transmits torque from the motor 63 to the shaft 17.
  • the shaft 17 is supported to rotate in a bearing 64 mounted in a housing 65 of the handtool 61 and thus provides a rotary output to which the anchor-setting tool 10 can be mounted, as well as other rotary bits or tools (not shown) for performing other tasks.
  • a printed circuit board 66 may be provided to mount components of a control circuit 72 including a trigger switch 68 operated by a trigger 69, a current sensor 67 for sensing the level of current drawn by the motor 63 a user-actuable mode selector 71 and a controller 70.
  • the tool 10 is connected to the anchor 73 as shown in Fig. 6, with the drill tip 14 screwed onto the projecting end 25.
  • the holder 12 is a running fit on the shaft 17, allowing it to be manually moved axially as needed such that the screw head 24 is held in engagement with the driver tip 31 by magnetic coupling between the magnet 13 and ferromagnetic flange 22.
  • the projecting assembly is thus self-supporting and stable.
  • the first drilling step involves placing the point 47 against the facing paper of a plasterboard panel, the trigger 69 is pressed and the speed of rotation may be proportional to trigger displacement.
  • the drilling direction of rotation tends to screw the screw fastener into the drill tip 14.
  • the conical nose portion 52 ensures there is no initial wandering of the drill tip 14 as it pierces the facing paper and starts cutting through the plaster core.
  • the front cutting edges 55 cut a pilot opening, that ensures the drilling action is gradual and helps mitigate the possibility that a piece of plaster much larger than the hole to be cut is broken off, while the rear cutting edges 57 then gradually extend the pilot opening to the finished size.
  • the user actuates the mode selector 71, as through a push button (not shown) mounted to the housing 65, thus providing an indication to the controller 70 to change the tool from a driver mode to a so-called set-and-extract mode. Otherwise, this mode change may be made before the drilling step since, as Fig. 8 shows, the current drawn by the motor during drilling (time period labelled “Drill” ) is at a much lower level that the subsequent peak level that occurs during setting of the anchor (time period labelled “Set” ) .
  • the tool 10 is then pushed axially, pressing the anchor 73 into the drilled hole, to engage the teeth 21 in the panel.
  • the trigger 69 is then pressed and held to keep the tool operating, and the driver turning in the drilling direction of rotation.
  • the controller 70 may measure an elapsed time from the time at which the trigger switch 68 is first actuated, and only start monitoring the current level signal from the current sensor 67 after a pre-determined elapsed time, which may be around 0.75s. This means that an in-rush current 74 that occurs during this pre-determined elapsed time is disregarded by the controller 70, even if it reaches the pre-defined peak current level, so as not to trigger reversal of the motor shortly after it is started.
  • the end 29 on the socket 15 moves towards the end 28 and collapses the strips 27 at the intermediate part 30 by closing the intermediate hinges, while the socket 15 does not rotate with the screw fastener 16 as it is fixed against rotation by the teeth 21.
  • the current level drawn by the motor tends to change with time as shown in Fig. 8 –decreasing from the in-rush peak 74. Then, when the strips 27 are fully collapsed and set on the back face of the panel, the torque required to rotate the screw fastener 16, and correspondingly the current drawn by the motor, increase quickly toward the pre-defined peak current level 75.
  • the controller 70 may initiate electric braking to brake rotation of the tool 10 and smoothly bring it to a stop, before reversing the motor i.e. ramping up driving torque to the motor to turn the driver in a direction opposite the drilling direction. In this manner, while the trigger 69 remains pressed, the tool automatically, and without abruptness, transitions from driving in the drilling direction to set the anchor 73, to driving in an opposite direction, to back the screw fastener 16 out of the socket 15.
  • the driving in the opposite direction brings the inner end 49 of the drill tip 14 into abutment with the outer end of the sleeve 15, and then unscrews the projecting end 25 from the blind recess 48 and the drill tip 14 thus drops off and is lost inside the wall cavity.
  • the driving in the opposite direction (time period labelled “Reverse” in Fig. 8) produces a current level substantially below the pre-defined peak current level 75.
  • the tool responds in the ordinary way by stopping the motor 63.
  • the process may be resumed, with the controller 70 responding to a signal indicating the pre-defined peak current level 75 before reversing the motor 63.
  • selecting a drive direction opposite to the drilling direction of rotation may also remove the tool from the set-and-extract mode.
  • an audible, visual or tactile warning may be provided to the user, to indicate the imminent reversal.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
PCT/CN2019/076311 2019-02-27 2019-02-27 Tool and method for setting an anchor WO2020172815A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/CN2019/076311 WO2020172815A1 (en) 2019-02-27 2019-02-27 Tool and method for setting an anchor
CN201990001312.0U CN217976925U (zh) 2019-02-27 2019-02-27 用于固定锚固件的工具
EP19917368.3A EP3931451A4 (en) 2019-02-27 2019-02-27 TOOL AND PROCEDURE FOR SETTING AN ANCHOR

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2019/076311 WO2020172815A1 (en) 2019-02-27 2019-02-27 Tool and method for setting an anchor

Publications (1)

Publication Number Publication Date
WO2020172815A1 true WO2020172815A1 (en) 2020-09-03

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ID=72238803

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/076311 WO2020172815A1 (en) 2019-02-27 2019-02-27 Tool and method for setting an anchor

Country Status (3)

Country Link
EP (1) EP3931451A4 (zh)
CN (1) CN217976925U (zh)
WO (1) WO2020172815A1 (zh)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2711565A2 (en) * 2012-09-20 2014-03-26 Robert Cousineau Self-undercut expansion anchor insertion system
US20150100096A1 (en) * 2013-10-07 2015-04-09 Spine Wave, Inc. Translating polyaxial screw
CN205798316U (zh) * 2016-05-25 2016-12-14 江苏东成机电工具有限公司 电动拉铆枪
US20180238367A1 (en) * 2017-02-23 2018-08-23 Brian M. Laue Wedge Anchor Setting Tool and Method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2711565A2 (en) * 2012-09-20 2014-03-26 Robert Cousineau Self-undercut expansion anchor insertion system
US20150100096A1 (en) * 2013-10-07 2015-04-09 Spine Wave, Inc. Translating polyaxial screw
CN205798316U (zh) * 2016-05-25 2016-12-14 江苏东成机电工具有限公司 电动拉铆枪
US20180238367A1 (en) * 2017-02-23 2018-08-23 Brian M. Laue Wedge Anchor Setting Tool and Method

Also Published As

Publication number Publication date
EP3931451A1 (en) 2022-01-05
EP3931451A4 (en) 2023-01-18
CN217976925U (zh) 2022-12-06

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